CA2555922A1

CA2555922A1 - Leak detection system

Info

Publication number: CA2555922A1
Application number: CA002555922A
Authority: CA
Inventors: Marwan Abboud; Jean-Pierre Lalonde; Johnny Al Asmar; John W. Lehman
Original assignee: Cryocath Technologies Inc.; Marwan Abboud; Jean-Pierre Lalonde; Johnny Al Asmar; John W. Lehman; Cryocath Technologies, Inc.
Current assignee: Medtronic Cryocath LP
Priority date: 1999-01-25
Filing date: 2000-01-25
Publication date: 2000-07-27
Anticipated expiration: 2020-01-25
Also published as: CA2555922C

Abstract

A surgical device includes a device body defining a sealed fluid path having a first end and a second end, a refrigerant supply in communication with the first end of the sealed fluid path, and a vacuum source in communication with the second end of the sealed fluid path.
Leak detection apparatus can be provided in communication with the sealed fluid path.

Claims

1. A surgical device comprising:
a catheter having proximal and distal end portions, and having a sealed flow lumen, the flow lumen having first and second end portions;
a supply of a cryogenic fluid in communication with the first end portion of the flow lumen;
a vacuum source in communication with the second end portion of the flow lumen;
an impedance measurement circuit disposed inside the flow lumen, including a first conductive element disposed on the distal end portion of the catheter, and a second conductive element disposed within the sealed flow lumen, the first conductive element being electrically isolated from the second conductive element.

2. The surgical device of claim 1, wherein the first conductive element is a metal catheter tip.

3. The surgical device of claim 1, wherein the second conductive element is a metal wire.

4. The surgical device of claim 1, further comprising a fluid-permeable insulation element disposed around the second conductive element.

5. The surgical device of claim 4, wherein the second conductive element is a metal wire.

6. The surgical device of claim 4, wherein the fluid-permeable insulation element is porous to allow passage of ionic fluids.

7. The surgical device of claim 4, wherein the fluid-permeable insulation element is a fabric.

8. The surgical device of claim 4, wherein the fluid-permeable insulation element is a salt-depleted polymer.

9 9. The surgical device of claim 4, wherein the fluid-permeable insulation element is a laser-drilled polymer.

10. A surgical device comprising:
a device body defining a sealed fluid path having a first end and a second end;
a supply of a cryogenic fluid in communication with the first end of the sealed fluid path;
a vacuum source in communication with the second end of the sealed fluid path;
and a leak detection apparatus in optical communication with the sealed fluid path.

11. The surgical device of claim 10, wherein the leak detection apparatus includes a blood detector.

12. The surgical device of claim 10, wherein the leak detection apparatus includes an infrared sensor.

13. The surgical device of claim 10, further comprising a control unit that is in communication with the leak detection apparatus, wherein the control unit is responsive to output from the leak detection apparatus to control fluid flow through the sealed fluid path.

14. A surgical device comprising:
a catheter having a proximal end and a distal end, and a fluid path through at least a portion of the catheter, the catheter having a fluid inlet and a fluid exhaust;
a console including a reservoir containing a supply of cryogenic fluid in communication with the fluid inlet of the catheter, a vacuum pump in communication with the fluid exhaust, and a control unit for controlling fluid movement from the reservoir;
a handle unit connecting the catheter to the console;

a first leak detector in the catheter, the first leak detector including a first optical sensor;
a second leak detector in the handle unit, the second leak detector including a second optical sensor; and a third leak detector in the console, the third leak detector including a third optical sensor.

15. The surgical device of claim 14, wherein the control unit is responsive to a signal output from one of the first and second leak detectors to stop a flow of fluid from the reservoir.

16. The surgical device of claim 15, wherein the control unit is responsive to a signal output from the third leak detector to stop operation of the vacuum pump after stopping the flow of fluid from the reservoir.

17. A surgical device comprising:
a catheter having proximal and distal end portions, and having a sealed first flow lumen, the first flow lumen having first and second portions;
a supply of a cryogenic fluid in communication with the first portion of the first flow lumen;
a vacuum source in communication with the second portion of the first flow lumen;
a first optically transparent window disposed in the catheter; and a first leak detector disposed externally to the first flow lumen and proximate to the first optically transparent window, said first leak detector being in optical communication with the second portion of the first flow lumen through the first optically transparent window.

18. The surgical device of claim 17, wherein said leak detector is an infrared sensor.

19. The surgical device of claim 18, wherein said infrared sensor includes a wavelength sensitive to blood composition.

20. The surgical device of claim 17, further comprising: a handle coupled to the catheter, said handle having a second flow lumen in fluid communication with the first flow lumen, said handle including a second optically transparent window, and a second leak detector disposed externally to the second flow lumen and proximate to the second optically transparent window, said second leak detector being in optical communication with the second flow lumen through the second optically transparent window.